Question

Assume that you measured exactly 2.0 mL of the sodium chloride solution into a small test tube. How many moles of sodium chloride are in the tube?

Answer 1

Answer:

0.034 mol (4dp)

Explanation:

Use the formula n = m/M where n= number of moles, m=mass in grams and M=molar mass in g/mol.

Therefore to find how many moles, divide the mass in grams (2) by the molar mass of sodium chloride which is 22.99+35.45

Answer 2

0.034 moles (rounded answer)

The molar mass of sodium chloride is 58.44 g/mol. Therefore, if you’re given 2.0 mL of it, that would be 0.034 moles.
2.0/58.44 = 0.03422313